Time-averaged VHE spectrum observed from HESS J1943+213. The shaded area represents the 1σ confidence level of the fitted spectrum using a power-law hypothesis. Only the statistical errors are shown and the upper limits are 68% confidence level. The lower panel shows the residual of the spectrum fit, which are the difference, in each reconstructed energy bin, between expected and observed number of excess events, normalized to uncertainty on the latter ((N_obs − N_exp)/ΔN_exp).